Control apparatus



Nov. 13, 1945. UEB 2,389,040

CONTROL APPARATUS Filed April 5, 1943 INVENTOR Mnmous GOTTLIEB.

BY J3 H I$,@-

ATTORNEY Patented Nov. 13, 1945 UNITED STATES, PATENT OFFICE CON TROLAPPARATUS ManiousGottlieb, Philadelphia, Pa", assignor to WestinghouseElectric Corporation, 7 East Pittsburgh, Pa., a corporation ofPennsylvania ApplicationApril 5, 1943,,ScriaLNo'. 481,811 3 Claims.,(cr. sass-ts).

This invention: relates to valves; more particularly to:an arrangementofvalvesforelastic-fluid utilizing device's;.for example, steam orgasturbines, compressors, et'c'., and'hasforan object toprovide-improved apparatus of'this character;

Witlrsmall: and medium size. turbines, it has been common practice. touse a" single governor- 'controlled valve. to admit steamto a chambercommunicating directly'with a. first nozzle, group andzindirectly with-asecondznozzle group through a passage from; the chamber, which passageis controlled bya: manually-operable valve. With this: arrangement, itisnecessary to use a governor-controlledzvalve of suificient size toprovide .tor flow of: the large valume: of steam required underconditions of low pressure and with the manually operable valve open topermit flow of the steam to both first and second nozzle groups.However, this produces the undesirable result that, with reverseconditions of high pressure and small volume and the manually-operablevalve closed, the governor-controlled valve is so nearly closed thatpoorer control is obtained.

The present invention eliminates this difficulty by the provision of adouble-seated governorcontrolled admission valve with a first passagefor conducting elastic fluid from one of the seats to the first nozzlegroup and a second passage, entirely independent of the first passage,for conducting elastic fluid from the other of the seats to the secondnozzle group. With this arrange ment, each valve of the double-seatvalve need be only large enough to pass the maximum volume of elasticfluid which may be required for one of the nozzle groups. This size isconsiderably smaller than that required for a valve passing elasticfluid for two nozzle blocks, as in the prior construction, and hence,when operating with minimum elastic fluid flow, the valve still hassufficient lift to permit of good control.

Therefore, a further object of the invention is to provide valvestructure for controlling admission of elastic fluid to apparatus forutilizing such fluid, together with an arrangement of ports and passagescontrolled by the valve structure, such that satisfactory control may beobtained under all conditions of operation of the apparatus.

These and other objects are effected by the invention as will beapparent from the following description and claims taken in connectionwith the accompanying drawing, forming a part of this application, inwhich the single figure is a fragmentary transverse sectional view ofapparatus involving the invention.

Referring tot'th'e drawing more indetail, 7 there is shown, at l0;aturbinecomprising a rotor II and acasing. ILZE therefor; the rotor andcasing 'can'yingrows of: blades [3. to which suitable moseats :24: and.22, respectively, adapted to. cooperate vwith corresponding, valve discs23-- and 24, respec- 'tivelyiv These valve discs: are carried in spaced,relationuporr avalve body 25, the latter having a valve stem 27-extending, from one end thereof andslidable-through bushings 23 and 29;Asimilar-but shorter stem. 30 extends from the" opposite end of thevalve body 25 and is slidably supported in the bearing 3|, carried bythe cage 13. The upper end 33 of the valve body 25 is slidably receivedin a bore 34- formed internally of the casing 11, the end 33 being ofsuch size as to substantially balance the opposite end of the valve bodyformed by the valve disc 24. In order to balance the pressures atopposite ends of the valve body, the latter is provided with a passage36 extending therethrough.

The valve stem 21 is of sufiicient length to extend beyond the casingand to be received between the bifurcations 38 formed at the end of alever 39 which is part of the governor mechanism linkage. The bifurcatedend 38 of this lever bears against a shoulder 40 formed on, or securedto, the stem 31 to move the latter downwardly, upward movement of thestem being produced by the compression spring 4|, positioned between theshoulder 40 and the casing l1.

Steam entering the casing through the passage l8 and passing through theupper valve seat 2| enters the pass-age 43 to flow to the second groupof nozzles l5. However, flow of steam through the passage 43 iscontrolled by the valve 44, which engages with a seat 45. The stem 46 ofthe valve 44 is threadedly mounted in a spider 41, carried by the casingIT. The free outer end of the valve stem 46 is provided with suitablemeans, such as the handwheel 48, whereby the valve may be manuallyadjusted to control flow of steam or other motive fluid through thepassage 43 to the second group of nozzles I5. Steam flowing from thepassage l8 past the lower valve seat 22 enters a passage 49 whichconducts it to the first group of nozzles l4.

The operation of this apparatus will be obvious to those skilled in theart and it will be appar- 2 ent that the objects and purposes set forthabove are accomplished by the construction illustrated and described.

While the invention has been shown in but one form, it will be obviousto those skilled in the art that it is not so limited, but issusceptible of various changes and modifications without departing fromthe spiritthereof, and it is desired, therefore, that only suchlimitations shall be placed thereupon as are specifically set forth inthe appended claims.

What is claimed is:

1. In apparatus for utilizing elastic fluid; first and second groups ofnozzles, means providing an inlet passage for elastic fluid, adouble-seat valve for automatically controlling flow of elastic fluidthrough said inlet passage, and including closure members spaced adistance corresponding to the spacing of the seats, whereby both of saidvalve seats are uncovered and covered simultaneously means providing afirst connecting passage for conducting elastic fluid passing one of thevalve seats of said double-seat valve to the first group of nozzles,means providing a second connecting passage independent of the firstconnecting passage for conducting elastic fluid passing the other of thevalve seats of said double-seat valve to the second group of nozzles,and a second valve for controlling flow of elastic fluid through saidsecond connecting passage.

2. In apparatus for utilizing elastic fluid, first and second nozzlemeans, casing structure having an inlet passage for elastic fluid; apair of opposed ports in opposite sides of said inlet passage; anannular seat associated with each of said ports; an automaticallyadjustable valve member including a pair of spaced circular closuremembers adapted, in one position of the valve member, to engage saidseats and close said ports, and in another position of the valve member,to be spaced from the seats and open the ports; the spacing of saidclosure members corresponding to the spacing of the annular seats of theopposed ports, whereby both of said ports are opened simultaneouslymeans providing a first connectin passage for conducting elastic fluidfrom one of said ports tq the first nozzle means; means providing asecond connecting passage independent of the first connecting passagefor conducting elastic fluid from the other of said ports to the secondnozzle means; and a second valve for controlling flow of elastic fluidthrough said second connecting passage.

3. In an elastic fluid turbine; a rotor, blading carried by the rotor; acasing for said rotor and blading; first and second groups of nozzlescarried by the casing for delivering elastic fluid t0 the blading; meansproviding a first passage for admitting elastic fluid to the casing,said passage terminating in a pair of ports; means providing a pair ofindependent passages, one passage of said pair of passages being adaptedto conduct elastic fluid from one of said ports to the first group ofnozzles and the other passage of said pair of passages being adapted toconduct elastic fluid from the other of said ports to the second groupof nozzles; first valve means responsive to governor action for openingand closing both of sai ports simultaneously; and second valve means forregulating flow of elastic fluid through said other passage of said pairof passages when said first valve means is in position to open both ofsaid ports.

MANIOUS GO'I'ILIEB.

